CN106661388B - Double-sided adhesive sheet, joining method using double-sided adhesive sheet, and method for producing double-sided adhesive sheet - Google Patents

Double-sided adhesive sheet, joining method using double-sided adhesive sheet, and method for producing double-sided adhesive sheet Download PDF

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Publication number
CN106661388B
CN106661388B CN201580040425.8A CN201580040425A CN106661388B CN 106661388 B CN106661388 B CN 106661388B CN 201580040425 A CN201580040425 A CN 201580040425A CN 106661388 B CN106661388 B CN 106661388B
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China
Prior art keywords
double
adherend
adhesive
sheet
sided
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CN201580040425.8A
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CN106661388A (en
Inventor
中原浩贵
副田义和
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Nitto Denko Corp
Nissho Corp
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Nitto Denko Corp
Nissho Corp
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/10—Removing layers, or parts of layers, mechanically or chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

Provided is a double-sided adhesive sheet which can smooth the work of attaching a double-sided tape to an adherend and can reduce the occurrence of wrinkles in the adherend when the adherend is adhered to the adherend. The double-sided tape 1 includes an adherend 2 formed in a film shape and having adhesive force on both sides in a thickness direction, and a pair of release films 3 arranged to sandwich the adherend 2 from the thickness direction. The double-sided adhesive tape 1 is molded to have a non-planar shape.

Description

Double-sided adhesive sheet, joining method using double-sided adhesive sheet, and method for producing double-sided adhesive sheet
Technical Field
The present invention relates to a double-sided adhesive sheet, a joining method using the double-sided adhesive sheet, and a method for manufacturing the double-sided adhesive sheet, and more particularly, to a double-sided adhesive sheet for joining a 2 nd adherend to a 1 st adherend, a joining method using the double-sided adhesive sheet for joining the 1 st adherend to the 2 nd adherend, and a method for manufacturing the double-sided adhesive sheet.
Background
Conventionally, double-sided pressure-sensitive adhesive sheets have been widely used for joining structural members of various industrial products and the like because they are superior in handling properties and adhesion to liquid adhesives.
As such a double-sided adhesive sheet, for example, a double-sided tape in which adhesive layers are provided on both sides of a nonwoven fabric has been proposed (for example, patent document 1).
Such a double-sided adhesive sheet is produced by bonding an adhesive layer on one side of a nonwoven fabric to an adherend, and then bonding an adhesive layer on the other side of the nonwoven fabric to an interior material to bond the adherend to the interior material.
[ Prior Art document ]
[ patent document ]
[ patent document 1 ] Japanese patent laid-open No. 2002-356660.
Disclosure of Invention
However, the double-sided tape of patent document 1 has a problem that the double-sided tape is easily wrinkled when attached to a non-planar (three-dimensional) adherend such as a curved surface, although the double-sided tape has flexibility and curved surface conformability by providing adhesive layers on both surfaces of a nonwoven fabric.
Therefore, when attaching a double-sided tape to an adherend having a non-planar shape, for example, a plurality of double-sided tapes are combined and attached to the adherend, or a cut is made in the double-sided tape, so that the double-sided tape is processed to follow the shape of the adherend.
However, even in those methods, there is a limit to reducing the occurrence of wrinkles in the double-sided tape, and there are cases where floating (gaps) are generated between the adherend and the double-sided tape or the double-sided tape is peeled off from the adherend.
Further, when a plurality of double-sided tapes are attached to an adherend, a plurality of attaching operations are required, and when a cut is made in a double-sided tape, a part of the double-sided tape needs to be cut before the attaching operation. Therefore, the work of attaching the double-sided tape to the adherend becomes complicated.
Accordingly, an object of the present invention is to provide a double-sided adhesive sheet, a joining method using the double-sided adhesive sheet, and a method for manufacturing the double-sided adhesive sheet, which can smooth the work of attaching a double-sided tape to an adherend and can surely reduce wrinkles generated in the adherend when the adherend is adhered to the adherend.
[ means of solution ]
The double-sided adhesive sheet of the present invention comprises an adhesive body in which at least an adhesive is kneaded, and is molded to have a non-planar shape.
According to this configuration, since the double-sided adhesive sheet is molded in advance to have a non-planar shape, the adherend can be attached along the non-planar shape of the adherend. Further, the non-planar shape of the double-sided adhesive sheet is molded in advance so as to follow the non-planar shape of the adherend, whereby the adherend can be reliably bonded to the non-planar shape of the adherend.
Therefore, the adherend and the adherend can be securely brought into close contact with each other, and the occurrence of wrinkles in the adherend can be securely reduced. In addition, it is not necessary to attach a plurality of double-sided tapes to the adherend or to provide a cut in the double-sided tapes, and therefore, the operation of attaching the adherend to the adherend can be made smooth.
Therefore, even if the adherend has a non-planar shape (three-dimensional shape), the work of attaching the adherend to the adherend can be made smooth, and wrinkles generated in the adherend can be reduced when the adherend is bonded to the adherend. Further, since the material having an insulating property is kneaded and used for an adherend requiring an insulating function, it is not necessary to design the material according to a conventional design method having an insulating property (space insulation) by separating members to be insulated from each other. Therefore, the size of the adherend can be further miniaturized.
The double-sided adhesive sheet of the present invention is formed in a film shape, includes an adhesive body having adhesive force on both sides in a thickness direction, and a pair of release films arranged to sandwich the adhesive body from the thickness direction, and is molded to have a non-planar shape.
According to this configuration, since the double-sided adhesive sheet is formed in advance to have a non-planar shape, the adherend exposed by peeling the release film can be attached along the non-planar shape of the adherend. Further, the non-planar shape of the double-sided adhesive sheet is formed in advance so as to follow the non-planar shape of the adherend, whereby the adherend can be reliably bonded to the non-planar shape of the adherend.
Therefore, the adherend and the adherend can be securely brought into close contact with each other, and the occurrence of wrinkles in the adherend can be securely reduced. In addition, since it is not necessary to attach a plurality of double-sided tapes to the adherend or to provide a cut in the double-sided tapes, the work of attaching the adherend to the adherend can be smoothed.
Therefore, even if the adherend has a non-planar shape (three-dimensional shape), the work of attaching the adherend to the adherend can be made smooth, and wrinkles generated in the adherend can be reduced when the adherend is bonded to the adherend.
Further, it is preferable that a peeling force for peeling the peeling film arranged on one surface in the thickness direction of the pressure-sensitive adhesive body from the pressure-sensitive adhesive body is different from a peeling force for peeling the peeling film arranged on the other surface in the thickness direction of the pressure-sensitive adhesive body from the pressure-sensitive adhesive body.
According to this configuration, since the peeling force of the peeling film (hereinafter referred to as a 1 st peeling film) on one surface in the thickness direction is different from the peeling force of the peeling film (hereinafter referred to as a 2 nd peeling film) on the other surface in the thickness direction, the peeling film (the 1 st peeling film or the 2 nd peeling film) having a relatively small peeling force can be easily peeled.
Therefore, in the work of attaching the adherend, even if the double-sided adhesive sheet has a non-planar shape, the surface of the adherend can be easily exposed, and by attaching the surface of the adherend to the adherend, the work of attaching the adherend to the adherend can be surely smoothed.
Further, the pair of release films preferably each contain a thermoplastic polymer.
According to this configuration, since the release film contains a thermoplastic polymer, when the double-sided adhesive sheet is heated, the release film softens, and the double-sided adhesive sheet is formed to have a non-planar shape. Then, when the double-sided adhesive sheet is cooled, the release film is hardened, and the double-sided adhesive sheet is reliably maintained in a non-planar shape.
That is, the double-sided adhesive sheet can be simply and reliably molded by heating and cooling.
The pressure-sensitive adhesive body preferably includes a substrate formed in a film shape and a pair of pressure-sensitive adhesive layers disposed so as to sandwich the substrate from the thickness direction.
According to this configuration, since the pressure-sensitive adhesive body includes the substrate, even if the double-sided pressure-sensitive adhesive sheet has a non-planar shape, the substrate can reliably hold the pair of pressure-sensitive adhesive layers. Therefore, even if an external force acts on the adherend in a state where the adhesive layer of the adherend is adhered to the adherend, the displacement of the adhesive layer can be reduced.
The pressure-sensitive adhesive body is preferably formed only of a pressure-sensitive adhesive layer formed in a film shape.
According to this configuration, since the adherend is formed only of the adhesive layer, the flexibility of the adherend can be improved, and the adherend can be reliably brought into close contact with the adherend.
The bonding method using a double-sided adhesive sheet of the present invention includes: a step of preparing a 1 st adherend having a non-planar shape; preparing the double-sided adhesive sheet having a non-planar shape along the 1 st adherend; a step of attaching the pressure-sensitive adhesive body exposed by peeling one of the pair of release films from the pressure-sensitive adhesive body to a non-planar shape of the 1 st pressure-sensitive adhesive body; and a step of attaching a 2 nd adherend to the adherend exposed by peeling the other of the pair of release films from the adherend.
According to this configuration, since the non-planar shape of the double-sided adhesive sheet is a non-planar shape along the 1 st adherend, in the step of attaching the adherend to the 1 st adherend in the non-planar shape, the adherend can be reliably attached to the 1 st adherend, and the occurrence of wrinkles in the adherend can be reliably reduced.
After the release film is peeled off from the pressure-sensitive adhesive body adhered to the 1 st pressure-sensitive adhesive body, the 2 nd pressure-sensitive adhesive body is adhered to the exposed pressure-sensitive adhesive body, whereby the 1 st pressure-sensitive adhesive body and the 2 nd pressure-sensitive adhesive body can be reliably joined.
The method for producing a double-sided adhesive sheet of the present invention comprises: preparing a processing sheet including an adhesive body formed in a film shape and having adhesive force on both surfaces in a thickness direction, and a pair of release films arranged to sandwich the adhesive body from the thickness direction; a step of heating and pressing at least a part of the processing sheet to form a non-planar shape; and a step of cooling the processed sheet having a non-planar shape while maintaining the processed sheet in a pressurized state.
According to this configuration, after the sheet is formed to have a non-planar shape by heating and pressing, the sheet is cooled while being kept in a pressed state, whereby the non-planar shape of the sheet can be reliably maintained.
That is, the sheet can be reliably molded by heating and cooling the processed sheet. Therefore, a double-sided adhesive sheet having a non-planar shape can be reliably produced.
Further, the pair of release films preferably each contain a thermoplastic polymer; heating the processed sheet to a softening point of the thermoplastic polymer or higher in the step of heating and pressing the processed sheet; in the step of cooling while maintaining the processed sheet in a pressurized state, the processed sheet is cooled to a softening point of the thermoplastic polymer or less.
According to this configuration, since the release film contains the thermoplastic polymer, the release film is reliably softened to be formed into the non-planar shape by heating the processing sheet to the softening point of the thermoplastic polymer or higher, and the release film is reliably hardened to maintain the non-planar shape by cooling the processing sheet to the softening point of the thermoplastic polymer or lower.
Therefore, the processed sheet can be reliably molded to have a non-planar shape, and thus a double-sided adhesive sheet having a non-planar shape can be more reliably manufactured.
[ technical effects ]
According to the double-sided adhesive sheet and the joining method using the double-sided adhesive sheet of the present invention, the work of attaching the double-sided tape to the adherend can be smoothed, and the occurrence of wrinkles in the adherend when the adherend is adhered to the adherend can be reduced. Further, according to the method for producing a double-sided adhesive sheet of the present invention, the above-described double-sided adhesive sheet can be reliably produced.
Drawings
Fig. 1A is a perspective view of a double-sided tape of embodiment 1 of the double-sided adhesive sheet of the present invention. Fig. 1B is a sectional view a-a showing the double-sided tape of fig. 1A.
Fig. 2A is an explanatory view for explaining a method of manufacturing the double-sided tape shown in fig. 1A, showing a state in which the processing pieces are arranged between the 1 st and 2 nd molds with a space therebetween. Fig. 2B is an explanatory view for explaining a method of manufacturing a double-sided adhesive tape, following fig. 2A, showing a state in which a worked piece is sandwiched between a 1 st metal mold and a 2 nd metal mold and molded. Fig. 2C is an explanatory view, following fig. 2B, for explaining a method of manufacturing a double-sided adhesive tape, showing a state where the worked piece is released from the 1 st metal mold and the 2 nd metal mold. Fig. 2D is an explanatory view for explaining a method of manufacturing a double-sided adhesive tape, following fig. 2C, to show a state where the double-sided adhesive tape is cut out from a work sheet.
Fig. 3A is an explanatory view for explaining the joining of the object to be set and the member by the double-sided tape shown in fig. 1A, showing a state where the 1 st release film is peeled from the double-sided tape. Fig. 3B is an explanatory view, following fig. 3A, for explaining the joining of the installation object and the member using the double-sided tape, showing a state where the 1 st adhesive layer is attached to the bent portion of the installation object. Fig. 3C is an explanatory view, following fig. 3B, for explaining the joining of the installation object and the member using the double-sided tape, showing a state where the member is joined to the bent portion by the adhesive body.
Fig. 4 is a sectional view of a double-sided adhesive tape according to embodiment 2 of the invention.
Fig. 5A is a perspective view of a double-sided adhesive tape according to embodiment 3 of the present invention. Fig. 5B is a perspective view of a double-sided adhesive tape according to embodiment 4 of the present invention.
Fig. 6 is a sectional view of a double-sided adhesive tape according to embodiment 5 of the invention.
Detailed Description
1. Structure of double-sided adhesive tape
As shown in fig. 1A, a double-sided tape 1 as an example of a double-sided adhesive sheet is molded to have a non-planar shape.
The non-planar shape is a shape that is concave or convex in the Z direction perpendicular to the XY plane with respect to the XY plane including the X direction of the predetermined direction and the Y direction perpendicular to the X direction. That is, when the double-sided adhesive tape 1 is placed on a horizontal surface, it has a concave portion or a convex portion in the up-down direction.
The double-sided tape 1 may have a non-planar shape as a whole or may have a non-planar shape only in a part.
In embodiment 1, the entire double-sided adhesive tape 1 is in a non-planar shape and is in a curved shape protruding or recessed in the Z direction. In the following description, when directions are referred to, the X direction is referred to as a left-right direction X, the Y direction is referred to as a front-back direction Y, and the Z direction is referred to as a vertical direction Z, specifically, with reference to the arrow directions shown in the drawings.
More specifically, the double-sided tape 1 has a curved shape protruding downward as viewed in the left-right direction X, and has a film shape (thin plate shape) extending in the left-right direction X. As shown in fig. 1B, the double-sided tape 1 includes an adhesive body 2 and a pair of release films 3.
The pressure-sensitive adhesive body 2 is an approximately central portion in the thickness direction of the double-sided tape 1, and includes a support layer 4 as an example of a base material and a pair of pressure-sensitive adhesive layers 5.
The support layer 4 is formed in a film shape (thin plate shape), and is hard or flexible at normal temperature (5 ℃ to 35 ℃) and preferably has flexibility. Examples of the support layer 4 include plastic films, foamed substrates, papers, cloths, nonwoven fabrics, and metal foils.
Examples of the plastic film include a polyolefin film (e.g., polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene), etc.), an ethylene-based copolymer film (e.g., ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-vinyl alcohol copolymer), ethylene-vinyl acetate copolymer (e.g., ethylene-vinyl acetate copolymer), ethylene-ethyl acrylate copolymer (e.g., ethylene-vinyl acetate copolymer), a polyester film (e.g., polyethylene terephthalate), polyethylene naphthalate, polybutylene terephthalate, etc.), a polyester film (e.g., polyethylene terephthalate), etc., a polyester film (e.g., polyethylene terephthalate), etc., a polyester film, etc., a polyester film, a film, polystyrene films, polyamide films (e.g., nylon 6(nylon 6), nylon 6, partially aromatic polyamide, etc.), polyvinyl chloride films (polyvinyl chloride film), polyvinylidene chloride films (polyvinyl chloride film), polycarbonate films, and the like.
Examples of the foam base include polyurethane foam (polyurethane foam) and polyethylene foam. Examples of the paper include kraft paper (kraft paper), crepe paper (crepe paper), and paper and insulating paper. Examples of the cloth include cotton cloth and short fiber cloth. Examples of the nonwoven fabric include a polyester nonwoven fabric, a vinylon nonwoven fabric, and an aramid fiber nonwoven fabric. Examples of the metal foil include aluminum foil and copper foil.
The support layer 4 is appropriately selected depending on the use of the double-sided tape 1, but is preferably a plastic film or a nonwoven fabric, more preferably a polyester film, and most preferably a polyethylene terephthalate film.
The thickness of the support layer 4 is, for example, 0.5 μm or more, preferably 10 μm or more, and more preferably 20 μm or more, and is, for example, 200 μm or less, preferably 150 μm or less, and more preferably 100 μm or less.
The pair of adhesive layers are disposed so as to sandwich the support layer 4 from the outside in the thickness direction, and are both ends in the thickness direction of the adherend 2. Therefore, both sides of the pressure-sensitive adhesive body 2 in the thickness direction have adhesive force. Of the pair of pressure-sensitive adhesive layers 5, the pressure-sensitive adhesive layer 5 on one side (lower side) in the thickness direction is defined as a 1 st pressure-sensitive adhesive layer 5A, and the pressure-sensitive adhesive layer 5 on the other side (upper side) in the thickness direction is defined as a 2 nd pressure-sensitive adhesive layer 5B.
The pressure-sensitive adhesive layer 5 is laminated on the surface of the support layer 4, and has flexibility at normal temperature (5 ℃ C. to 35 ℃ C. inclusive). The adhesive layer 5 is formed of an adhesive.
The adhesive agent for forming the adhesive layer 5 is not particularly limited, and known adhesive agents such as acrylic adhesive agents, rubber adhesive agents (natural rubber adhesive agents, synthetic rubber adhesive agents, and the like), silicone adhesive agents, polyester adhesive agents, urethane adhesive agents, polyamide adhesive agents, epoxy adhesive agents, vinyl alkyl ether base adhesive agents, fluorine adhesive agents, and thermoplastic adhesive agents can be mentioned.
The form of the adhesive is not particularly limited, and various forms such as a thermoplastic adhesive such as an emulsion adhesive, a solvent adhesive, and a hot melt adhesive, an oligomer adhesive, and a solid adhesive can be used.
The binder may be used alone or in combination of 2 or more.
Among these adhesives, acrylic adhesives are preferable because of ease of molding into a non-planar shape (three-dimensional shape), and acrylic adhesives having 2 to 8 carbon atoms (butyl acrylate and the like) are more preferable.
The glass transition point (Tg) of the adhesive is, for example, at least-70 ℃, preferably at least-50 ℃, for example at most-30 ℃, preferably at most-5 ℃. The glass transition point (Tg) is defined as the peak of the loss shear modulus G' measured by a dynamic viscoelasticity measuring apparatus (measurement conditions: shear mode, temperature rise rate of 5 ℃/min, frequency of 1 Hz).
When the glass transition point (Tg) of the adhesive is equal to or higher than the lower limit, the material can be easily designed, and when the glass transition point (Tg) of the adhesive is equal to or lower than the upper limit, the adhesive layer 5 can be reliably in a rubber state at normal temperature, and the adhesive layer 5 can be reliably made to follow the shape of the release film 3.
The thickness of the pressure-sensitive adhesive layer 5 is, for example, 3 μm or more, preferably 5 μm or more, more preferably 10 μm or more, for example 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less.
The thickness of the pressure-sensitive adhesive layer 5 is, for example, 50% or more, preferably 200% or more, for example 2000% or less, preferably 1000% or less, relative to the thickness of the support layer 4.
The thicknesses of the pair of adhesive layers 5 (1 st adhesive layer 5A and 2 nd adhesive layer 5B) may be the same or different from each other.
The adhesive layer 5 may be a single layer or a multilayer (laminate).
Further, the adhesive layer 5 may be provided to the support layer 4 through another layer (lower layer). Examples of such another layer (lower layer) include an intermediate layer, a lower coating layer, and a base material layer (particularly, a film layer, a nonwoven fabric layer, etc.).
The adhesive force of the pressure-sensitive adhesive layer 5 is, for example, 5N/20mm or more, preferably 10N/20mm or more, for example 100N/20mm or less, preferably 70N/20mm or less. The adhesive force can be measured by the adhesive force measurement test described below.
Adhesion force measurement test:
the adherend was cut into a size of 20mm in width and 100mm in length, and a PET film for a liner (thickness: 25 μm) was bonded to one side of the adherend to prepare a measurement sample. Next, the adhesive surface of the adhesive layer for measuring the adhesive force was pressure-bonded to an adherend (stainless steel plate (SUS304BA plate) with a 2kg roller 1 round trip and left under an environment of 23 ℃ x 50% RH for 30 minutes, and after the left, the measurement sample was peeled off at a tensile speed of 300mm/min and a peel angle of 180 ° using a general tensile compression tester (apparatus name "tensile compression tester TG-1 kN", manufactured by Minebea) to measure the adhesive force, and the measurement was performed under an environment of 23 ℃ x 50% RH.
The adhesive forces of the pair of adhesive layers 5 (the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B) may be the same as each other, and may be different from the viewpoint of adjusting the peeling force of the peeling film to be described later.
When the adhesive force of the 1 st adhesive layer 5A and the adhesive force of the 2 nd adhesive layer 5B are different from each other, for example, the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B are formed of different adhesives from each other, respectively.
That is, the pair of adhesive layers 5 (the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B) may be formed of the same adhesive or different adhesives.
The pair of release films 3 are disposed at both ends of the double-sided tape 1 in the thickness direction so as to sandwich the adherend 2 from the outside of the double-sided tape 1 in the thickness direction. Of the pair of release films 3, the release film 3 on one side (lower side) in the thickness direction is distinguished as a 1 st release film 3A, and the release film 3 on the other side (upper side) in the thickness direction is distinguished as a 2 nd release film 3B.
That is, the 1 st release film 3A is adhered to the lower face (convex face) of the 1 st adhesive layer 5A, and the 2 nd release film 3B is adhered to the upper face (concave face) of the 2 nd adhesive layer 5B.
The pair of release films 3 are each formed into a hard film shape (sheet shape) at normal temperature (5 ℃ to 35 ℃) and have a curved shape protruding downward as viewed from the left-right direction X and a film shape (sheet shape) extending in the left-right direction as shown in fig. 1A and 1B.
Examples of the release film 3 include paper, nonwoven fabric (for example, aramid fiber nonwoven fabric), and resin film. In the release film 3, a resin film is preferable from the viewpoint of three-dimensional processability.
The resin film is formed of a thermoplastic polymer, and examples thereof include a polyolefin film (e.g., polyethylene, polypropylene, polybutylene, polybutadiene, polymethylpentene (polymethylpentene), etc.), an ethylene-vinyl acetate copolymer film, a polyvinyl chloride film, a vinyl chloride copolymer film, a polyester film (e.g., polyethylene terephthalate, polybutylene terephthalate, etc.), a polyurethane film, and the like.
Among the resin films, a polyolefin film and a polyester film are preferable, and a polyethylene film and a polyethylene terephthalate film are more preferable.
The thickness of the release film 3 is, for example, 5 μm or more, preferably 10 μm or more, more preferably 15 μm or more, for example 200 μm or less, preferably 100 μm or less, more preferably 50 μm or less.
When the thickness of the release film 3 is within the above range (not less than the lower limit and not more than the upper limit), the non-planar shape (three-dimensional shape) of the double-sided tape 1 is easily maintained, and the peeling workability of the self-adhesive layer 5 can be improved.
The thickness of the release film 3 is, for example, 50% or more, preferably 100% or more, for example, 1000% or less, preferably 500% or less, with respect to the pressure-sensitive adhesive layer 5 (1 st pressure-sensitive adhesive layer 5A). That is, the release film 3 is preferably thicker than the adhesive layer 5.
The thicknesses of the pair of release films 3 (the 1 st release film 3A and the 2 nd release film 3B) may be the same or different from each other.
The release film 3 may be subjected to various treatments such as release, stain-proofing treatment, and antistatic treatment as needed.
Examples of the release and stain-proofing treatments include a method in which the surface of the release film 3 is treated with an organic release agent (e.g., silicone, fluorine-based long-chain alkyl, fatty amide, etc.) or an inorganic release agent (e.g., silicon oxide powder, etc.). Therefore, a release treatment layer is provided on the surface of the release film 3.
Examples of the antistatic treatment method include a method of applying an antistatic agent (e.g., quaternary ammonium salt) to the surface of the release film 3, a method of applying an antistatic agent to the surface of the release film 3 by evaporation, and a method of mixing an antistatic agent into the release film 3.
The pair of release films 3 (the 1 st release film 3A and the 2 nd release film 3B) may be the same as each other or different from each other.
The pair of release films 3 (the 1 st release film 3A and the 2 nd release film 3B) are preferably formed in the same manner. Specifically, the cross-sectional shapes of the 1 st release film 3A and the 2 nd release film 3B when cut in the vertical direction Z and the horizontal direction X are substantially the same as each other.
The peeling force (23 ℃, 50% RH) for peeling the release film 3 from the adhesive layer 5 is, for example, 0.01(N/50mm) or more, preferably 0.1(N/50mm) or more, for example, 2(N/50mm) or less, preferably 1(N/50mm) or less at a stretching speed of 300mm/min and a peeling angle of 180 °.
Further, in the double-sided tape 1, the peeling force for peeling the 1 st release film 3A from the lower face (convex face) of the 1 st pressure-sensitive adhesive layer 5A and the peeling force for peeling the 2 nd release film 3B from the upper face (convex face) of the 2 nd pressure-sensitive adhesive layer 5B may be the same, but are preferably different from each other.
More specifically, in the joining operation described later, the peeling force for peeling the 1 st release film 3A peeled earlier than the 2 nd release film 3B from the convex surface of the 1 st pressure-sensitive adhesive layer 5A is smaller than the peeling force for peeling the 2 nd release film 3B from the concave surface of the 2 nd pressure-sensitive adhesive layer 5B.
In the joining operation described later, the convex surface of the 1 st pressure-sensitive adhesive layer 5A is adhered to the inner surface of the bent portion 22 of the object 20, and then the 2 nd release film 3B is peeled off and the concave surface of the 2 nd pressure-sensitive adhesive layer 5B is adhered to the concave surface 21.
The peeling force (23 ℃, 50% RH) for peeling the 1 st release film 3A from the 1 st pressure-sensitive adhesive layer 5A is, for example, 0.01(N/50mm) or more, preferably 0.1(N/50mm) or more, for example, 0.7(N/50mm) or less, preferably 0.4(N/50mm) or less at a stretching speed of 300mm/min and a peeling angle of 180 degrees.
The peeling force (23 ℃ C., 50% RH) for peeling the 2 nd release film 3B from the 2 nd pressure-sensitive adhesive layer 5B is, for example, 0.1(N/50mm) or more, preferably 0.2(N/50mm) or more, for example, 1.0(N/50mm) or less, preferably 0.7(N/50mm) or less at a stretching speed of 300mm/min and a peeling angle of 180 ℃.
The peeling force for peeling the 2 nd release film 3B from the 2 nd pressure-sensitive adhesive layer 5B is, for example, 100% or more, preferably 200% or more, for example 1000% or less, preferably 500% or less, of the peeling force for peeling the 1 st release film 3A from the 1 st pressure-sensitive adhesive layer 5A.
Therefore, the 1 st release film 3A can be easily peeled from the 1 st pressure-sensitive adhesive layer 5A, and the 1 st pressure-sensitive adhesive layer 5A can be easily attached to a bent portion of the installation object 20 in a bonding operation to be described later. Therefore, the joining operation of the installation object 20 and the member 21 can be smoothly performed.
Examples of the method for making the peeling force of the 1 st peeling film 3A and the peeling force of the 2 nd peeling film 3B different from each other include a method in which the 1 st peeling film 3A and the 2 nd peeling film 3B are formed of different adhesives, a method in which the inner surfaces in the thickness direction of the 1 st peeling film 3A and the 2 nd peeling film 3B are treated with different release agents, a method in which one side of the peeling film 3 (the 1 st peeling film 3A or the 2 nd peeling film 3B) is formed of a release-treated resin film, and the other side of the peeling film 3 is formed of a release-treated polyolefin film, and a method in which resin films having different thicknesses are used as a pair of peeling films 3.
That is, if the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B are formed of different adhesives, the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B may have different adhesive forces, and thus the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B may have different peeling forces.
Even if the adhesive forces of the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B are the same, the peeling forces of the 1 st release film 3A and the 2 nd release film 3B may be different from each other if the inner surfaces in the thickness direction of the 1 st release film 3A and the 2 nd release film 3B are treated with different release agents from each other.
2. Method for manufacturing double-sided adhesive tape
Next, a method for manufacturing the double-sided tape 1 will be described.
In manufacturing this double-sided adhesive tape 1, as shown in fig. 2A to 2D, first, a processing sheet 9 is prepared (preparation step).
As shown in fig. 2A, the processing sheet 9 includes an adherend 2 having adhesive force on both surfaces in the thickness direction, and a pair of release films 3 arranged so as to sandwich the adherend 2, and is formed in a film shape of a substantially flat plate. In the preparation of this processed sheet 9, the adhesive layers 5 (the 1 st adhesive layer 5A and the 2 nd adhesive layer 5B) are applied to both sides of the support layer 4 by a known application method (for example, application by a known coater), for example.
Thereafter, the pair of release films 3 are attached to the pair of adhesive layers 5. Thereby, the processed sheet 9 is prepared (prepared).
The processed sheet 9 is not particularly limited as long as it has a size that allows cutting at least 1 double-sided adhesive tape 1, but from the viewpoint of manufacturing cost, it is preferable that a plurality of double-sided adhesive tapes 1 can be cut and formed in a shape continuous in the front-rear direction Y.
Next, as shown in fig. 2B and 2C, after a part of the processed sheet 9 is formed into a non-planar shape (heating step), the non-planar shape part of the processed sheet 9 is cooled (cooling step). Thus, the work sheet 9 is molded to have a non-planar shape. In addition, molding is to impart shape to the part.
This heating step and cooling step are performed, for example, by the molding apparatus 10.
The molding apparatus 10 includes a 1 st die unit 7, a 2 nd die unit 8, and a control unit not shown.
The 1 st die unit 7 includes a 1 st die 11, a heater not shown, and a wiring 13.
The 1 st metal mold 11 has a prismatic shape extending in the left-right direction, and a lower surface of the 1 st metal mold 11 is formed as a convex portion 11A. The convex portion 11A corresponds to an inner surface of a curved portion 22 of an installation object 20 described later, and is formed in an approximately circular arc shape in a side view bulging downward as viewed from the left-right direction X.
The heater, not shown, is embedded inside the 1 st die 11. The wiring 13 is electrically connected to a heater not shown and a power supply not shown.
The 1 st die unit 7 is configured to supply power to a heater, not shown, through the wiring 13, and to heat the 1 st die 11 by the heater, not shown. The 1 st die unit 7 is configured such that the 1 st die 11 is movable in the vertical direction.
The 2 nd die unit 8 is disposed at a lower distance from the 1 st die unit 7. The 2 nd die unit 8 includes a 2 nd die 12, a cooling pipe 14, a heater not shown, and a wire 16.
The 2 nd die 12 has a prismatic shape extending in the left-right direction X, and the upper surface of the 2 nd die 12 is formed as a concave portion 12A. The concave portion 12A corresponds to the convex portion 11A of the 1 st die 11, and has substantially the same shape as the inner surface of the curved portion 22 of the installation object 20 described later. Specifically, the concave portion 12A is formed in an approximately circular arc shape in a side view recessed downward as viewed from the left-right direction X.
The cooling pipe 14 is provided to pass through the 2 nd die 12, and is configured to flow a cooling medium such as cooling water therein.
A heater, not shown, is embedded inside the 2 nd metal mold 12. The wiring 16 is electrically connected to a heater not shown and a power supply not shown.
The 2 nd die unit 8 is configured to supply power to the 2 nd die 12 through the wiring 16, to heat the 2 nd die 12 by a heater not shown, and to cool the 2 nd die 12 by flowing a cooling medium through the cooling pipe 14. The 2 nd die unit 8 is configured such that the 2 nd die 12 moves in the vertical direction.
The control unit, not shown, is electrically connected to the 1 st die unit 7 and the 2 nd die unit 8, respectively, and is configured to control the operation of the 1 st die unit 7 and the 2 nd die unit 8. The control unit, not shown, is constituted by a microcomputer including a CPU, a ROM, a RAM, and the like.
The molding apparatus 10 first performs a heating step as shown in fig. 2A.
In the heating step, the work piece 9 is arranged along the front-rear direction Y between the vertical directions Z of the 1 st die 11 and the 2 nd die 12.
Next, the 1 st die 11 and the 2 nd die 12 are heated to the 1 st heating temperature by the control of the control unit not shown.
The 1 st heating temperature is not particularly limited as long as it is not lower than the temperature of the deformed sheet 9 and not higher than the heat-resistant temperature, and is, for example, 80 ℃ or higher, preferably 100 ℃ or higher, for example 220 ℃ or lower, preferably 200 ℃ or lower.
When the 1 st heating temperature is not less than the lower limit, the release film 3 of the double-sided tape 1 can be reliably deformed, and when the 1 st heating temperature is not more than the upper limit, the deterioration of the pressure-sensitive adhesive layer 5 of the double-sided tape 1 can be reduced.
When the release film 3 is a resin film formed of a thermoplastic polymer, the 1 st heating temperature is preferably not lower than the softening point of the thermoplastic polymer (release film 3). The softening point of the release film 3 is defined as the glass transition point (Tg) of the release film 3. That is, the 1 st heating temperature is preferably not less than the glass transition point of the thermoplastic polymer (release film 3).
Further, the 1 st heating temperature of the 1 st metal mold 11 and the 1 st heating temperature of the 2 nd metal mold 12 may be the same as or different from each other.
Next, when the temperature of each of the 1 st die 11 and the 2 nd die 12 reaches the 1 st heating temperature, the control unit, not shown, moves the 1 st die 11 downward and the 2 nd die 12 upward.
Therefore, the work piece 9 is sandwiched between the convex portion 11A of the 1 st die 11 and the concave portion 12A of the 2 nd die 12 and pressurized.
In this case, the pressure applied to the processed sheet 9 is set to be, for example, 1MPa or more, preferably 5MPa or more, for example 1000MPa or less, preferably 800MPa or less, from the upper and lower sides of the processed sheet 9.
If the pressing condition of the processing piece 9 is not lower than the lower limit value, the processing piece 9 can be reliably formed in a non-planar shape, and if the pressing condition of the processing piece 9 is not higher than the upper limit value, the overextension of the processing piece 9 can be suppressed.
The 1 st die 11 and the 2 nd die 12 are each maintained at the 1 st heating temperature even in a state where the processed sheet 9 is sandwiched therebetween.
The sheet 9 is heated and pressed by the 1 st die 11 and the 2 nd die 12 for a predetermined time.
The predetermined time is, for example, 0.5 seconds or more, preferably 1 second or more, for example, 60 seconds or less, preferably 40 seconds or less.
The 1 st die 11 and the 2 nd die 12 are heated from the 1 st heating temperature to the 2 nd heating temperature as necessary within a predetermined time.
The 2 nd heating temperature is a high temperature higher than the 1 st heating temperature, and is, for example, 90 ℃ or higher, preferably 110 ℃ or higher, for example, 200 ℃ or lower, preferably 180 ℃ or lower.
Therefore, in the processed sheet 9, the portion sandwiched by the 1 st die 11 and the 2 nd die 12 is in a non-planar shape, specifically, deformed along the curved shape of the convex portion 11A and the concave portion 12A. Further, hereinafter, a portion of the work piece 9 sandwiched by the 1 st metal mold 11 and the 2 nd metal mold 12 is referred to as a curved portion 9A.
The curvature radius of the curved portion 9A is, for example, 1cm or more, preferably 5cm or more, for example, 20cm or less, preferably 10cm or less.
In the heating step, when the release film 3 is a resin film, the support layer 4 is a plastic film, and the pressure-sensitive adhesive layer 5 is an acrylic pressure-sensitive adhesive, the release film 3, the support layer 4, and the pressure-sensitive adhesive layer 5 are in a rubber state, respectively.
Next, after a predetermined time has elapsed, the molding device 10 completes the heating step and performs the cooling step.
In the cooling step, the control unit (not shown) stops heating the 1 st die 11 and the 2 nd die 12 while maintaining the 1 st die 11 and the 2 nd die 12 in a state of sandwiching the bent portion 9A of the processed sheet 9, and flows a cooling medium (e.g., cooling water) through the cooling pipe 14.
Next, after the 2 nd metal mold 12 is cooled to the cooling temperature, it is maintained for a predetermined time (cooling step).
The cooling temperature is, for example, 3 ℃ or more, preferably 5 ℃ or more, for example, 80 ℃ or less, preferably 70 ℃ or less.
When the release film 3 is a resin film formed of a thermoplastic polymer, the cooling temperature is preferably not higher than the softening point of the thermoplastic polymer (release film 3). That is, the cooling temperature is preferably not higher than the glass transition point of the thermoplastic polymer (release film 3).
The predetermined time is, for example, 0.5 seconds or more, preferably 1 second or more, for example, 60 seconds or less, preferably 40 seconds or less.
Therefore, the bent portion 9A of the work piece 9 is cooled while being held under pressure by the 1 st die 11 and the 2 nd die 12.
In this case, when the release film 3 is a resin film, the support layer 4 is a plastic film, and the pressure-sensitive adhesive layer 5 is an acrylic pressure-sensitive adhesive, the support layer 4 and the pressure-sensitive adhesive layer 5 are in a rubber state, respectively, but the release film 3 is in a glass state and supports the support layer 4 and the pressure-sensitive adhesive layer 5.
Next, as shown in fig. 2C, the control unit, not shown, moves the 1 st die 11 upward and the 2 nd die 12 downward. Therefore, the pressing (pressure) to the curved portion 9A of the work piece 9 is released, and the work piece having the curved portion 9A is taken out from the molding device 10.
Next, as shown in fig. 2D, unnecessary portions are cut out from the work sheet 9 as needed, and the double-sided adhesive tape 1 is cut out (cutting-out step).
Examples of the method of cutting the double-sided adhesive tape 1 from the processed sheet 9 include known processing methods such as cutting and punching. In fig. 2D, the processing sheet 9 is cut by the cutter 15, and only the curved portion 9A of the processing sheet 9 is cut out as the double-sided tape 1.
The double-sided adhesive tape 1 was prepared according to the above. The double-sided tape 1 has a non-planar shape having the same shape as the inner surface of the curved portion 22 described later.
Further, when the double-sided adhesive tape 1 is continuously manufactured, after a part of the processing piece 9 is molded into the curved shape portion 9A as described above, the processing piece 9 is moved in the front-rear direction Y. The other portions of the processing sheet 9 are formed into a curved shape in the same manner as described above. Then, a plurality of double-sided tapes 1 (curved portions) are cut out from the processed sheet 9.
3. Bonding an object to be mounted and a member using a double-sided tape
Next, the following describes joining of the object 20 as an example of the 1 st adherend and the member 21 as an example of the 2 nd adherend using the double-sided tape 1, with reference to fig. 3A to 3C.
In joining the object 20 and the member 21 using the double-sided tape 1, the object 20 is first prepared.
The installation object 20 is not particularly limited as long as it has a non-planar shape, and examples thereof include substrates of electric and electronic appliances, bodies of automobile vehicles, walls and ceilings of buildings, and examples thereof include steel plates, resin members, and wood.
In embodiment 1, the installation object 20 is a steel plate having an L-shape in a body of an automobile vehicle, and a bent portion 22 of the steel plate is formed in a non-planar shape by beveling. The curved portion 22 is formed in a circular arc shape.
Next, the double-sided tape 1 is prepared. Here, the curved shape of the double-sided tape 1 is, specifically, the convex surface of the 1 st adhesive layer 5A is along the inner surface (inner surface in the radial direction) of the curved portion 22 of the installation object 20.
Next, the 1 st release film 3A is peeled from the pressure-sensitive adhesive body 2, and the convex surface of the 1 st pressure-sensitive adhesive layer 5A is exposed. In this state, the adherend 2 is supported by the 2 nd release film 3B, and thus the curved shape is maintained.
Next, as shown in fig. 3B, the convex surface of the 1 st adhesive layer 5A is stuck to the curved portion 22 of the installation object 20 so as to be in close contact with the inner surface of the curved portion 22.
Next, the 2 nd release film 3B is peeled from the double-sided tape 1 (the adherend 2), and the 2 nd adhesive layer 5B is exposed. Then, the member 21 is attached to the 2 nd adhesive layer 5B.
The member 21 is not particularly limited, and examples thereof include electric/electronic components, automobile interior parts, automobile exterior parts, and house interior parts. In example 1, the member 21 is an automotive interior member formed of a foam.
In this way, the joining of the setting object 20 and the member 21 using the double-sided tape 1 is completed.
As shown in fig. 1A and 1B, the double-sided adhesive tape 1 is molded in advance to have a non-planar shape. Therefore, as shown in fig. 3A to 3B, the adherend 2 exposed by peeling the release film 3 can be attached along the non-planar shape (curved portion 22) of the installation object 20. Further, the non-planar shape of the double-sided tape 1 is molded in advance so as to follow the curved portion 22 of the installation object 20, whereby the adhesive body can be reliably attached to the curved portion 22.
Therefore, even if the shape of the installation object 20 is a non-planar shape, the adhesive body 2 can be reliably brought into close contact with the installation object 20, and the occurrence of wrinkles in the adhesive body can be reliably reduced.
Therefore, since the work of attaching the adherend 2 to the installation object 20 can be made smooth, it is possible to reduce the occurrence of wrinkles in the adherend 2 when the adherend 2 is attached to the installation object 20.
Further, since the non-planar shape of the double-sided tape 1 corresponds to the non-planar shape of the installation object 20, for example, even if the installation object 20 has a complicated shape, the adhesive body 2 can be reliably stuck to the installation object 20, and the accuracy of positioning the adhesive body 2 with respect to the installation object 20 can be improved.
However, when the double-sided tape 1 is used for joining interior components, it is difficult to secure a large working space as compared with when the double-sided tape 1 is used for joining exterior components. Even in this case, since the non-planar shape of the double-sided tape 1 corresponds to the non-planar shape of the installation object 20, the adhesive body 2 and the installation object 20 can be reliably attached, and thus the installation object 20 and the member 21 can be reliably joined.
Further, since a larger adhering area of the adherend 2 to the installation object 20 can be secured as compared with the case where the double-sided tape 1 is provided with the notch, the lifting (gap) and peeling of the adherend 2 can be reliably suppressed.
Further, as shown in fig. 3A to 3C, the peeling force for peeling the 1 st release film 3A from the adhesive body 2 is different from the peeling force for peeling the 2 nd release film 3B from the adhesive body 2. More specifically, the peeling force of the 1 st peeling film 3A is smaller than that of the 2 nd peeling film 3B. Therefore, the 1 st release film 3A can be easily peeled.
Therefore, even if the double-sided tape 1 has a non-planar shape, the surface (the 1 st adhesive layer 5A) of the adhesive body 2 attached to the installation object 20 can be easily exposed in the attaching work of the adhesive body 2 to the installation object 20. Therefore, the work of attaching the adherend 2 to the installation object 20 can be surely smoothed.
As shown in fig. 2A to 2C, since the release film 3 is a resin film formed of a thermoplastic polymer, when the double-sided adhesive tape 1 (the processing sheet 9) is heated, the release film 3 is softened, and the double-sided adhesive tape 1 (the processing sheet 9) is surely deformed to have a non-planar shape. After that, when the double-sided adhesive tape 1 (the processing sheet 9) is cooled, the release film 3 is hardened, and the double-sided adhesive tape 1 is surely maintained in a non-planar shape.
That is, the double-sided adhesive tape 1 (the processed sheet 9) can be simply and surely molded by heating and cooling.
As shown in fig. 1B, the adherend 2 comprises a support layer 4. Therefore, even if the double-sided adhesive tape 1 has a non-planar shape, the support layer 4 can reliably hold the pair of adhesive layers 5. Therefore, even if an external force acts on the adherend 2 in a state where the adhesive layer 5 of the adherend 2 is adhered to the installation object 20, the displacement of the adhesive layer 5 can be reduced.
As shown in fig. 3A to 3C, the non-planar shape of the double-sided adhesive tape 1 is along the curved portion 22 of the installation object 20. Therefore, in the step of attaching the adhesive body 2 to the curved portion 22, the adhesive body 2 can be reliably attached to the curved portion 22, and the occurrence of wrinkles in the adhesive body 2 can be reliably reduced.
After the 2 nd release film 3B is peeled off from the adhesive body bonded to the bent portion 22, the member 21 is bonded to the exposed adhesive body 2, whereby the installation object 20 and the member 21 can be reliably joined.
Further, as shown in fig. 2A to 2D, after the processed sheet 9 is formed to have a non-planar shape by heating and pressing, the processed sheet 9 is cooled while being kept in a pressed state, and thus the non-planar shape of the processed sheet 9 can be reliably maintained.
That is, the sheet 9 can be reliably molded by heating and cooling. Therefore, the double-sided adhesive tape 1 having a non-planar shape can be reliably manufactured.
Further, since the release film 3 contains a thermoplastic polymer (preferably, is formed of a thermoplastic polymer), as shown in fig. 2B, the release film 3 is surely softened and formed into a non-planar shape by heating the processing sheet 9 to a softening point of the thermoplastic polymer or higher, and the release film 3 is surely hardened and maintained in the non-planar shape by cooling the processing sheet 9 to a softening point of the thermoplastic polymer or lower.
Therefore, the processing piece 9 is reliably molded to have a non-planar shape, and thus the double-sided adhesive tape 1 having a non-planar shape can be more reliably manufactured.
4. Example 2
Next, referring to fig. 4, embodiment 2 of the double-sided tape of the present invention will be described. In embodiment 2, the same components as those in embodiment 1 are assigned the same reference numerals, and descriptions thereof are omitted.
Although in embodiment 1, as shown in fig. 1B, the adherend comprises the support layer 4 and the pair of adhesive layers 5, in embodiment 2, as shown in fig. 4, the adherend 2 does not have the support layer 4, but is formed of only 1 adhesive layer 5 (without support). That is, in the double-sided tape 1 of embodiment 2, 1 adhesive layer 5 is sandwiched between a pair of release films 3.
In embodiment 2, the thickness of the pressure-sensitive adhesive layer 5 is, for example, 1 μm or more, preferably 10 μm or more, more preferably 50 μm or more, for example 3000 μm or less, preferably 500 μm or less, more preferably 100 μm or less.
The adhesive layer 5 may be a single layer or a multilayer (laminate).
The thickness of the release film 3 is, for example, 50% or more, preferably 100% or less, for example, 1000% or less, preferably 500% or less, with respect to the thickness of the pressure-sensitive adhesive layer 5.
The thicknesses of the pair of release films 3 (the 1 st release film 3A and the 2 nd release film 3B) may be the same or different from each other.
In this double-sided tape 1, the peeling force for peeling the 1 st peeling film 3A from the lower face (convex face) of the adhesive layer 5 and the peeling force for peeling the 2 nd peeling film 3B from the upper face (concave face) of the adhesive layer 5 may be the same as each other, but are preferably different from each other.
More specifically, the peeling force for peeling the 1 st peeling film 3A from the convex surface of the adhesive layer 5 is smaller than the peeling force for peeling the 2 nd peeling film 3B from the concave surface of the adhesive layer 5.
Further, the peeling force for peeling the 1 st peeling film 3A from the adhesive layer 5 is the same as the above-described peeling force for peeling the 1 st peeling film 3A from the 1 st adhesive layer 5A, and the peeling force for peeling the 2 nd peeling film 3B from the adhesive layer 5 is the same as the above-described peeling force for peeling the 2 nd peeling film 3B from the 2 nd adhesive layer 5B.
Examples of the method of making the peeling force of the 1 st release film 3A and the peeling force of the 2 nd release film 3B different from each other include a method of forming the adhesive layer 5 into a plurality of layers (laminate) and forming the plurality of layers with different adhesives, a method of treating the inner surfaces in the thickness direction of each of the 1 st release film 3A and the 2 nd release film 3B with different release agents, a method of making one release film 3 (the 1 st release film 3A or the 2 nd release film 3B) of a release-treated resin film and making the other release film 3 of a polyolefin film without release treatment, and a method of making a pair of release films 3 of resin films different from each other in thickness.
That is, when the plurality of layers of the pressure-sensitive adhesive layer 5 are formed of different pressure-sensitive adhesives, the peeling forces of the 1 st release film 3A and the 2 nd release film 3B can be made different from each other because the adhesive forces of the plurality of layers can be made different from each other.
Even if the pressure-sensitive adhesive layer 5 is a single layer, the peeling forces of the 1 st release film 3A and the 2 nd release film 3B can be made different from each other by subjecting the inner surfaces in the thickness direction of the 1 st release film 3A and the 2 nd release film 3B to different release treatments from each other.
In manufacturing this double-sided tape 1, a processing sheet including the adhesive layer 5 and the pair of release films 3 is prepared. In the production of the processed sheet, the pressure-sensitive adhesive layer 5 is applied to the upper surface of the 1 st release film 3A by, for example, a known coating method (for example, coating by a known coater). Thereafter, the 2 nd release film 3B is attached to the upper surface of the adhesive layer 5. Thus, a processed sheet was prepared.
Next, as in example 1, after heating and pressing at least a part of the processed sheet, cooling was performed, and then the double-sided adhesive tape 1 was cut out from the processed sheet.
Thereby, the double-sided tape 1 of example 2 was prepared.
According to embodiment 2, since the adherend 2 is formed only of the adhesive layer 5, the flexibility of the adherend 2 can be improved, and the adherend 2 can be reliably brought into close contact with the bent portion 22 of the installation object 20.
5. Example 3 and example 4
Next, embodiment 3 and embodiment 4 of the double-sided tape according to the present invention will be described with reference to fig. 5A and 5B. In embodiment 3 and embodiment 4, the same components as those in embodiment 1 are assigned the same reference numerals, and descriptions thereof are omitted.
Although in embodiment 1, as shown in fig. 1A, the entire double-sided adhesive tape 1 is formed in a non-planar shape and has a curved shape protruding downward, there is no particular limitation if at least a part of the shape of the double-sided adhesive tape 1 is a non-planar shape.
For example, in embodiment 3, the double-sided adhesive tape 1 is formed into a bowl shape (cup shape) opened upward.
In embodiment 4, the double-sided tape 1 includes a non-planar portion 26 and a planar portion 25 as an example of the non-planar shape.
The non-planar portion 26 is disposed at about the center of the double-sided adhesive tape 1 in a plan view, and has an arc shape recessed downward.
The flat portion 25 is a peripheral edge portion of the double-sided tape 1, and surrounds the non-flat portion 26 in a plan view. The planar portion 25 is formed along the XY plane, and extends radially outward from the entire periphery of the non-planar portion 26.
6. Example 5
Next, a description will be given of example 5 of the double-sided tape of the present invention with reference to fig. 6.
In embodiment 1, as shown in fig. 1B, the double-sided tape 1 is formed in multiple layers, since the pressure-sensitive adhesive body 2 includes the pressure-sensitive adhesive body 2 and the pair of release films 3, and the pressure-sensitive adhesive body 2 includes the support layer 4 and the pair of pressure-sensitive adhesive layers 5, in embodiment 5, as shown in fig. 6, the double-sided tape is formed in a single layer.
That is, the double-sided tape 1A of the present embodiment is constituted only by the adhesive body 2A as shown in fig. 6. The pressure-sensitive adhesive body 2A is formed by kneading an insulating material, a thermoplastic pressure-sensitive adhesive, and an aramid thermoplastic resin.
In manufacturing this double-sided tape 1A, first, a processed sheet having the adherend 2A is prepared.
Next, in the same manner as in example 1 above, after heating and pressing at least a part of the processed sheet, cooling was performed, and then the double-sided adhesive tape 1A was cut out from the processed sheet. Thus, the double-sided tape 1A of the present example was prepared. Further, after the molding into a predetermined shape, since it is necessary to cool the thermoplastic adhesive while maintaining this state, it is a condition that the thermoplastic adhesive and the aramid thermoplastic resin overlap each other in the softening temperature range or the melting start temperature range.
The double-sided tape 1A is used as an insulating paper, and is mainly used for an adherend such as an AC/DC converter, a DC/DC converter, an inverter, and a charger. Therefore, when used in this position, the double-sided tape 1A is preferably configured to have heat-resistant temperature, voltage resistance, and tracking resistance, because such properties are required. In this way, since the adhesive can be used for an adherend requiring an insulating function, it is not necessary to design the adherend according to a conventional design method in which members to be insulated are separated from each other to have insulating properties (space insulation), and the adherend can be further downsized.
Further, since the insulating paper may contain a material having an insulating property, the double-sided tape 1 of embodiment 1, embodiment 3, and embodiment 4 may be used in addition to this embodiment. That is, if the insulating paper is used for the support layer 4, the insulating paper can be used. In the present embodiment, the adhesive body 2A is mixed with a material having insulating properties, but the material having insulating properties may not be mixed unless it is used as an insulating paper.
7. Modification example
In the above-described embodiments 1 to 4, as shown in fig. 2A to 2D, after preparing the work sheet 9 including the pressure-sensitive adhesive body 2 and the pair of release films 3, the double-sided tape 1 is manufactured by molding a part of the work sheet 9 into a non-planar shape by the molding device 10, but the method of manufacturing the double-sided tape 1 is not limited thereto.
For example, after a pair of release films are each formed into a non-planar shape by the forming device 10, respectively, the double-sided tape 1 can be manufactured by sandwiching an adhesive body separately prepared between the release films 3.
However, in this manufacturing method, it is necessary to sandwich the adhesive body between the pair of release films 3 each having a non-planar shape, which complicates the manufacturing operation. Further, since the pair of release films 3 are molded separately, there is a case where a dimensional error occurs in each of the non-planar shape portions of the release films 3. Therefore, as in the above-described embodiments 1 to 4, from the viewpoint of the work efficiency and dimensional error, it is preferable to integrate the pressure-sensitive adhesive bodies 2 and 1 with the release film 3 (processed sheet) to form a non-planar shape.
In addition, the 1 st to 5 th embodiments and the modifications may be combined as appropriate.
The double- sided tapes 1 and 1A are used for joining structural members of various industrial products, and more specifically, can be suitably used for joining electrical/electronic components, interior parts for automobiles, exterior parts for automobiles, interior parts for houses, and the like.
Description of the reference numerals
1. 1A: double-sided adhesive tape
2. 2A: adhesive body
4: support body
5: adhesive layer
9: processing sheet
20: installation object
21: component part
22: bending part
26: non-planar portion

Claims (9)

1. A double-sided adhesive sheet comprising an adhesive body in which at least an adhesive is kneaded, wherein the double-sided adhesive sheet is integrally molded so that the upper surface has a concave or convex shape, and the lower surface has a convex shape corresponding to the concave shape of the upper surface or a concave curved shape corresponding to the convex shape of the upper surface.
2. A double-sided adhesive sheet comprising an adhesive body formed in a film shape and having adhesive force on both sides in a thickness direction, and a pair of release films arranged so as to sandwich the adhesive body from the thickness direction, wherein the double-sided adhesive sheet is integrally molded in a curved shape having a concave or convex upper surface and a convex or concave lower surface corresponding to the concave or convex upper surface.
3. The double-sided adhesive sheet according to claim 2, wherein a peeling force for peeling the peeling film arranged on one surface in the thickness direction of the adhesive body from the adhesive body is different from a peeling force for peeling the peeling film arranged on the other surface in the thickness direction of the adhesive body from the adhesive body.
4. The double-sided adhesive sheet according to claim 3, wherein the pair of release films each contain a thermoplastic polymer.
5. The double-sided adhesive sheet according to claim 2, wherein the adhesive body comprises a substrate formed in a film shape, and a pair of adhesive layers disposed so as to sandwich the substrate from the thickness direction.
6. The double-sided adhesive sheet according to claim 2, wherein the adherend is formed only of an adhesive layer formed in a film shape.
7. A bonding method using a double-sided adhesive sheet, comprising:
preparing a 1 st adherend having a curved shape with a concavity or convexity on the upper surface and a concavity corresponding to the concavity or convexity on the upper surface on the lower surface;
a step of preparing a double-sided adhesive sheet according to claim 2, the double-sided adhesive sheet having a curved shape along the 1 st adherend;
a step of attaching the pressure-sensitive adhesive body exposed by peeling one of the pair of release films from the pressure-sensitive adhesive body to the curved shape of the 1 st pressure-sensitive adhesive body; and
and a step of attaching a 2 nd adherend to the adherend exposed by peeling the other of the pair of release films from the adherend.
8. A method for producing a double-sided adhesive sheet, comprising:
preparing a processing sheet including an adhesive body formed in a film shape and having adhesive force on both surfaces in a thickness direction, and a pair of release films arranged to sandwich the adhesive body from the thickness direction;
heating and pressing at least a part of the processing sheet to form a curved shape having a concave or convex upper surface and a convex or concave lower surface corresponding to the concave or convex upper surface; and
and cooling the processed sheet formed into the curved shape while maintaining the processed sheet in a pressurized state.
9. The method of producing a double-sided adhesive sheet according to claim 8, wherein each of the pair of release films comprises a thermoplastic polymer; heating the processed sheet to a softening point of the thermoplastic polymer or higher in the step of heating and pressing the processed sheet; in the step of cooling while maintaining the processed sheet in a pressurized state, the processed sheet is cooled to a softening point of the thermoplastic polymer or less.
CN201580040425.8A 2014-07-24 2015-07-23 Double-sided adhesive sheet, joining method using double-sided adhesive sheet, and method for producing double-sided adhesive sheet Active CN106661388B (en)

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US20170081559A1 (en) 2017-03-23
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HUE053887T2 (en) 2021-07-28
EP3173450B1 (en) 2020-08-26

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